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Honestly, given the cheap China quality and insane customer service from 2M, the price difference isn't going to matter in this case IMO. I wouldn't use 2M stuff at all no matter the price.
Milltek is using HJS German cats, the best in the world, just like Fabspeed. But Milltek's are selling for about $3100 and Fabspeed's are $5K.
Just curious what you're after by removing the cats. More sound? Unless these are restrictive, I doubt you'd notice a difference in power. Modern cats typically flow really well.
Try 25 additional RWHP in the usable midrange. Add in the sound (with no drone like the C5 or C6 got with cat deletes) and it's worth it. Yes I have a CEL, I know of only one person who has made the 3M deletes not throw a CEL.